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  • 42.60.Fc  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Numerical study of active mode locking in pulsed solid-state lasers (1993)
    Springer
    Applied physics 57 (1993), S. 349-357 
    Details
    ISSN: 1432-0649
    Keywords: 42.60.Fc ; 42.55.Rz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Transient mode locking of spiking solid-state lasers is studied with the help of two theoretical approaches. The first of them is an extension of the previous transient theory with single-mode rate equations to find the limited spike build-up time depending on the modulation index. The second is based on semiclassical multimode equations describing both spiking behaviour and formation of the picosecond pulse from the initial noise. The derivation of the equations as well as a comparison of results from both approaches are given. The obtained numerical results agree with experimental data. It is shown that the pulsewidth in a spiking laser can approach the small value predicted by the steady-state theory. This minimal pulsewidth can be reached at a smaller modulation index than predicted by the standard transient mode locking theory. The minimal modulation index for generation of good picosecond pulses free of noise is found to be ∼0.6 in our case. Losses connected with amplitude modulation have a negligible effect on spike build-up time and pulse duration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332460
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical study of the spiking instability caused by modulation frequency detuning in an actively mode-locked solid-state laser (1995)
    Springer
    Applied physics 61 (1995), S. 81-88 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Rz ; 42.60.Fc ; 42.60.Gd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied both analytically and numerically the transient active mode locking in the case of a modulation frequency detuning. Analytical results for pulse width and position, extending previous works, are obtained within the frame of the stationary theory by assuming that a short pulse restores its shape after each round trip. Numerical evaluation leads to relaxation oscillations and change of the short-pulse shape. The results of both approaches agree with each other only for small detunings, when laser is operated in the steady state. For larger detunings the laser dynamics change dramatically, and the three operation modes observed earlier in experiments were demonstrated numerically: sequences of damped relaxation oscillations, deep periodic spiking and chaotic spiking. The periodic spiking can be used to increase the intensity of mode-locked pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01090976
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Acousto-optic mode-locker for Nd:Lasers using paratellurite (1991)
    Springer
    Applied physics 53 (1991), S. 194-197 
    Details
    ISSN: 1432-0649
    Keywords: 78.20.Hp ; 42.60.Fc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The design of an acousto-optic modulator using paratellurite requiring only low driving power is described. Because of the high figure of merit a high modulation index can be achieved. To avoid an intermediate transmission peak the modulator should not be operated in the Bragg-regime but rather in the transition regime. The time dependent transmission for this regime is calculated as a function of the material parameters. Experimentally, modulation indices up to 10 are obtained. Using such a TeO2 mode-locker a pulsed Nd:Cr:GSGG laser delivered pulses down to 70 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330236
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